Script-Generation Archite cture in .NET

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Script-Generation Archite cture
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GetScript Internals
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You probably won t be surprised to see just what is going on under the hood with the GetScript method It s surprising that no matter how far we get we still have to build up script one way or another The calls to Append
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PropertiesScript, AppendEventScript,
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AppendReference
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Script just loop through the internal collections of the properties, events,
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and references entries we added, converting the data types into JSON, where appropriate, and assigning them to the $create statement that is built up using the StringBuilder:
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protected internal override string GetScript() { if (!stringIsNullOrEmpty(thisID)) { thisAddProperty("id", thisID); } StringBuilder builder = new StringBuilder(); builderAppend("$create("); builderAppend(thisType); builderAppend(", "); thisAppendPropertiesScript(builder); builderAppend(", "); thisAppendEventsScript(builder); builderAppend(", "); thisAppendReferencesScript(builder); if (thisElementIDInternal != null) { builderAppend(", "); builderAppend("$get(\""); builderAppend( JavaScriptStringQuoteString( thisElementIDInternal)); builderAppend("\")"); } builderAppend(");"); return builderToString(); }
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ScriptBehaviorDescriptor
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The ScriptBehaviorDescriptor class is designed to generate a $create statement for use with a SysUIBehavior class The constructor, see Listing 52, takes the namespace and class name of the SysUIBehavior class
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5: Adding Client Capabilitie s to Ser ver Controls
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and the ID of the current associated control The class is primarily used when creating controls that support the IExtenderControl interface or inherit from the ExtenderControl class These types of controls are designed to allow adding client-side behavior to existing server controls and use the ScriptBehaviorDescriptor class to gather information used in the initialization of their corresponding behavior class
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Listing 52 ScriptBehaviorDescriptor Constructor
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ScriptBehaviorDescriptor("NamespaceClass", ID)
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ScriptControlDescriptor
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The ScriptControlDescriptor class is designed to generate a $create statement for use with a SysUIControl class The constructor, see Listing 53, takes the namespace and class name of the SysUIControl class and the ID of the current associated control The class is primarily used when creating controls that support the IScriptControl interface or inherit from the ScriptControl class These types of controls are designed to allow adding client-side functionality internally to the controls and use the ScriptControlDescriptor class to gather information used in the initialization of their corresponding control class
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Listing 53 ScriptComponentDescriptor Constructor
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ScriptComponentDescriptor ("NamespaceClass", ID)
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Script Resources ASPNET 20 introduced the ability for external resources to be embedded within web applications and controls and then accessed through the WebResourceaxd URL This functionality opened the door for developers to embed images, JavaScript les, and CSS les into the assembly, eliminating the need to have these les located on the le system ASPNET 20 AJAX Extensions rely heavily on this feature to deliver the various JavaScript les embedded in the SystemWebExtensions DLL that contains all its functionality
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Script-Generation Archite cture Adding Script Resources
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The process to add script resources to your project is relatively simple The only requirement is that your project compile to a DLL This limits the possibilities to web applications, which are the default in Visual Studio 2008, and control libraries To properly con gure a script resource, you must complete these two steps:
1 Make the JavaScript le a resource 2 Add the WebResource attribute to the assembly
Embedding a JavaScript File
To make a script le an embedded resource is a simple process that entails selecting the script le, selecting the properties for the le, and changing the build action to Embedded Resource (see Figure 52)
Figure 52 Selecting the Embedded Resource option of the build action
5: Adding Client Capabilitie s to Ser ver Controls Using the WebResource Attribute
The WebResource attribute is used to identify an embedded resource that can be used as a web resource The rst parameter speci es the name of the resource, and should be named using the pattern RootNamespacePathTo JavaScriptFile, with the root namespace being the namespace of the project and path to JavaScript le being the full path, including folder names if not in the root of the project In the sample in Listing 54, the Image Rotatorjs le is contained in a project called ImageRotatorExtender, and the le is at the root of the project If the le were below, for instance, the Scripts folder, the entry would be ImageRotatorExtenderScriptsImage Rotatorjs instead The second parameter speci es the MIME type to be used In our case, we are referring to JavaScript les, so a content type of text/javascript is used